v1 coverage-audit slice b1. The audit found reconnect_turn had no
caller — every presenter dropped the stream on disconnect instead of
resuming, leaving the "reference SSE-resume implementation" (design-
brief §3/§8d) unreachable. Add stream_turn_resilient as the single
shared resume surface (design-brief §8b "share the consumer, branch
the presenter") and route cli --send through it.
- stream_turn_resilient wraps stream_turn + reconnect_turn: on
SseConnectionDropped (mid-stream drop or clean EOF before terminal),
resume from the last-seen sse_id via reconnect_turn (Last-Event-ID),
up to max_reconnects (default 5). last_seen persists across attempts.
- Non-drop reconnect failures (412/410/400/TurnIdFlip/SseConnectFailed)
propagate unchanged, per contract #1's "surface, not recover".
- cli.py: --send consumer now drives stream_turn_resilient (transparent
reconnect). tui/web still consume bare stream_turn (follow-up).
- Contract #1 amended (FN stream_turn_resilient) + validated; 8 TDD
cases (happy, resume-after-1/2-drops, clean-EOF resume, unresumable
zero-event, max-reconnects-exhausted, zero-budget, buffer-expired-
propagates). Suite 518 green; ruff + mypy clean on touched code.
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